A variable which can assume finite or countably infinite number of values is known as ________.

(a)

continuous

(b)

discrete

(c)

qualitative

(d)

none of them

If p(x) =\(\frac{1}{10}\), c = 10, then E(X) is ________.

(a)

zero

(b)

\(\frac{6}{8}\)

(c)

1

(d)

-1

In a discrete probability distribution the sum of all the probabilities is always equal to ________.

(a)

zero

(b)

one

(c)

minimum

(d)

maximum

A discrete probability function p(x) is always non-negative and always lies between ________.

(a)

0 and \(\infty \)

(b)

0 and 1

(c)

–1 and +1

(d)

–∞ and +∞

The height of persons in a country is a random variable of the type ________.

(a)

discrete random variable

(b)

continuous random variable

(c)

both (a) and (b)

(d)

neither (a) nor (b)